AS Chemistry electron configuration help

Watch
rfours
Badges: 3
Rep:
?
#1
Report Thread starter 4 years ago
#1
On a chemistry unit 1 past paper it asked for the electron configuration of a rubidium atom, which has a proton number of 37.

I wrote, 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 4d1
However the answer is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s1

I understand that rubidium is in group 1 and the s block so 5s1 makes sense, but I thought that there were the 4d and 4f sub-shells before the 5s one so I'm confused why it jumps from 4p to 5s?
0
reply
samb1234
Badges: 13
Rep:
?
#2
Report 4 years ago
#2
(Original post by rfours)
On a chemistry unit 1 past paper it asked for the electron configuration of a rubidium atom, which has a proton number of 37.

I wrote, 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 4d1
However the answer is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s1

I understand that rubidium is in group 1 and the s block so 5s1 makes sense, but I thought that there were the 4d and 4f sub-shells before the 5s one so I'm confused why it jumps from 4p to 5s?
It's exactly the same reason the 4s is filled before the 3d
1
reply
EmBem03
Badges: 1
Rep:
?
#3
Report 4 years ago
#3
(Original post by rfours)
On a chemistry unit 1 past paper it asked for the electron configuration of a rubidium atom, which has a proton number of 37.

I wrote, 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 4d1
However the answer is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s1

I understand that rubidium is in group 1 and the s block so 5s1 makes sense, but I thought that there were the 4d and 4f sub-shells before the 5s one so I'm confused why it jumps from 4p to 5s?
The 4d orbital has a slightly higher energy level than the 5s orbital so the 5s orbital fills first (just as with the 4s and 3d orbitals earlier on, which you have correctly filled in.)
1
reply
rfours
Badges: 3
Rep:
?
#4
Report Thread starter 4 years ago
#4
Thank you!
0
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Back
to top
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

Do you have the space and resources you need to succeed in home learning?

Yes I have everything I need (58)
64.44%
I don't have everything I need (32)
35.56%

Watched Threads

View All